基于NSGA-Ⅱ模拟水肥耦合对小茴香产量及品质的影响OA

Addressing the low water and fertilizer use efficiency and the lack of well-defined,high-efficiency management regimes for fennel in the arid region of Ningxia,this study investigated the effects of coupled irrigation and fertilization of the physiological traits,fruit quality,and yield of fennel(Foeniculum vulgare)cultivated in Haiyuan County,Zhongwei City,Ningxia.A two-factor,three-level factorial experiment was conducted with three irrigation levels(1 800,3 000,4 200 m³/hm2)and three fertilization levels(270,450,630 kg/hm2),yielding nine treatments.Second-order(quadratic)polynomial regression models were developed to relate irrigation and fertilization amounts to essential oil content,yield per hectare,water use efficiency,and the partial factor productivity of fertilizer.The non-dominated sorting genetic algorithm(NSGA-II)was then used to optimize these models and identify the optimal water-fertilizer regime.The results indicate that irrigation,fertilization,and their interaction significantly affected all fennel growth indices.Essential oil content,yield per hectare,water use efficiency,and partical factor productivity exhibited unimodal responses,increasing initially and then decreasing with higher irrigation and fertilization inputs,indicating the existence of an optimal supply range.The optimal treatment was 4 200 m³/hm2 of irrigation combined with 450 kg/hm2 of fertilizer.NSGA-II optimization recommended an irrigation amount of 3 693.6 m³/hm2 and a fertilization amount of 536.19 kg/hm2 as the optimal water-fertilizer regime.